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Identification documents 2
Immigrant populations 1
Immigration and emigration 2
Immortality 1
Imperialism 1
Incest 1
Income 11
Individualism 2
Industrial occupations 1
Industrialization 13
Industry 17
Infantry 3
Influenza 2
Inoculations 1
Intellectual development 1
Intellectual life 4
Internal affairs 1
International laws 2
International relations 25
International trade 6
International travel 4
Intoxication 3
Introspection 1
Invasions 5
Inventions 2

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